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Grade 1 · Math · Challenge

Free Missing Addends Within 20 worksheet - version 3

Find the missing part in addition equations through 20. This printable version includes 12 grade-appropriate questions and a separate answer sheet.

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Missing Addends Within 20

Grade 1 · Stretch challenge · 12 questions · Version PG-TT1YHA-1OAJ

Free printable
1.__ + 10 = 20
2.__ + 9 = 12
3.__ + 15 = 19
4.__ + 6 = 20
5.__ + 2 = 2
6.__ + 0 = 20
7.__ + 1 = 20
8.__ + 2 = 19
9.__ + 4 = 13
10.__ + 0 = 8
11.__ + 15 = 16
12.__ + 10 = 15
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Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 3
  1. __ + 10 = 2010
  2. __ + 9 = 123
  3. __ + 15 = 194
  4. __ + 6 = 2014
  5. __ + 2 = 20
  6. __ + 0 = 2020
  7. __ + 1 = 2019
  8. __ + 2 = 1917
  9. __ + 4 = 139
  10. __ + 0 = 88
  11. __ + 15 = 161
  12. __ + 10 = 155

Worked example

__ + 6 = 14. Think 14 - 6, so the missing addend is 8.

Common mistake

Adding the known addend and total together.

Helpful hint

Subtract the known part from the total.